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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: DanMcG on March 12, 2020, 11:47:13 am

Title: I could use some help with an engine decode.
Post by: DanMcG on March 12, 2020, 11:47:13 am

I just picked up a 400 ci 3951509 basket case and I'm have a problem decoding the numbers on the right front of the block.

The numbers are F0317T space S
and T77518541  Is the T77 for truck and the rest the vin number?

Can anyone help me out here? Thanks

Title: Re: I could use some help with an engine decode.
Post by: zieg85 on March 12, 2020, 12:31:51 pm

Here is 2 possibilities...TLS   1977   400   conv.cab                   R LF4   175   4   K-10 to 2500
                                 TLS   1979   400   con. cab, a/t, Cal   R LF4   170   4   K-10 to 2500

Title: Re: I could use some help with an engine decode.
Post by: zieg85 on March 12, 2020, 12:33:45 pm

Those are the only 2 I could find looking for engine code T_S and 400 CID

Title: Re: I could use some help with an engine decode.
Post by: DanMcG on March 12, 2020, 12:56:48 pm

Thanks zieg85 , but it's a 2 bolt main. 
Edit: or does the"4" you listed stand for four barrel?

Title: Re: I could use some help with an engine decode.
Post by: zieg85 on March 12, 2020, 02:45:03 pm

Quote from: DanMcG on March 12, 2020, 12:56:48 pm

Thanks zieg85 , but it's a 2 bolt main. 
Edit: or does the"4" you listed stand for four barrel?

4bbl carbination

Title: Re: I could use some help with an engine decode.
Post by: DanMcG on March 13, 2020, 05:15:39 am

Can anyone explain the T77.... number? I'm been searching the net and it doesn't make sense to me. It has 9 digits and everything I read about has 8.

Title: Re: I could use some help with an engine decode.
Post by: Poppy 87 on March 14, 2020, 07:07:59 pm

Could one of those character be a "Z" instead of a 7?

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Title: Re: I could use some help with an engine decode.
Post by: MIKE S on March 14, 2020, 07:53:28 pm

I think T is for Tonawanda engine plant

Title: Re: I could use some help with an engine decode.
Post by: DanMcG on March 15, 2020, 11:02:41 am

So what I have been told is that if the second 7 is a Z then it would be K= GMC, 7=1977 and Z =Fremont Ca plant.
And as far as it being a 77 or 79, the casting date is October 18, 76 so 77 would have to be the build date.

Thanks for the input everyone!

Title: Re: I could use some help with an engine decode.
Post by: Poppy 87 on March 15, 2020, 12:39:40 pm

Quote from: DanMcG on March 15, 2020, 11:02:41 am

So what I have been told is that if the second 7 is a Z then it would be K= GMC, 7=1977 and Z =Fremont Ca plant.
And as far as it being a 77 or 79, the casting date is October 18, 76 so 77 would have to be the build date.

Thanks for the input everyone!

Glad to see that you found it!

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Title: Re: I could use some help with an engine decode.
Post by: JohnnyPopper on March 15, 2020, 03:11:13 pm

Just a question: why is the ancestry of motor parts important?

I mean, is there a quest to make a project 'correct'?

My question is not to knock anyone who might be a purist, I just haven't noticed this as a trend.

Now if you're talking VW, those purists are in a rare stratus, just ask them!